How many checklist(s) do you have?
I initial had a few different excels running. Over time I have taken and merged them into one workbook with different tabs just to make life easier.
Excel is truly my best friend through this wedding. It has accepted and ignored my miss spellings and poor grammar, allowed me to color code EVERYTHING, and even though I start things in separate files I can still merge them together once I'm less frazzled.
Don't get me wrong me wrong! I still have a hard binder planner put out by The Knot with a wealth of information but it doesn't really suit me.
It taught me some wonderful things (like what questions to ask which vendors), but I'm hosting a small wedding. I'm also DIYing a lot of it so it's not going to fit in the formulas.
What I do have is a little notebook and pen kept with me for when I met people, vendors, or have an idea an I'm not around the computer, that way I can write it down and reference it later.